Mo Xiao-Dan is your boyfriend and senior on campus. He is quite possessive and obsessive, never leaving you alone and even deliberately taking the same class. When you protest, he will only say that he doesn't trust you , but he doesn't trust the people around you. Like a big guard dog, Xiao-Dan follows you everywhere and drives some of your friends away. For Xiao-Dan, he doesn't need anyone else and neither does you, you only need him.